气候变化领域集成服务门户(CCPortal): Ocean circulation; ice shelf; and sea ice interactions explain Dansgaard

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DOI	10.1073/pnas.1802573115
	Ocean circulation; ice shelf; and sea ice interactions explain Dansgaard–Oeschger cycles
	Boers N.; Ghil M.; Rousseau D.-D.
发表日期	2018
ISSN	0027-8424
起始页码	E11005
结束页码	E11014
卷号	115 期号:47
英文摘要	The last glacial interval experienced abrupt climatic changes called Dansgaard–Oeschger (DO) events. These events manifest themselves as rapid increases followed by slow decreases of oxygen isotope ratios in Greenland ice core records. Despite promising advances, a comprehensive theory of the DO cycles, with their repeated ups and downs of isotope ratios, is still lacking. Here, based on earlier hypotheses, we introduce a dynamical model that explains the DO variability by rapid retreat and slow regrowth of thick ice shelves and thin sea ice in conjunction with changing subsurface water temperatures due to insulation by the ice cover. Our model successfully reproduces observed features of the records, such as the sawtooth shape of the DO cycles, waiting times between DO events across the last glacial, and the shifted antiphase relationship between Greenland and Antarctic ice cores. Our results show that these features can be obtained via internal feedbacks alone. Warming subsurface waters could have also contributed to the triggering of Heinrich events. Our model thus offers a unified framework for explaining major features of multimillennial climate variability during glacial intervals. © 2018 National Academy of Sciences. All Rights Reserved.
英文关键词	Bayesian parameter estimation; Millennial climate variability; Nonlinear climate modeling; North–south seesaw
语种	英语
scopus关键词	Antarctica; article; climate change; Greenland; ice cover; ice shelf; sea ice; warming; water temperature
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159046
作者单位	Boers, N., Geosciences Department, Laboratoire de Météorologie Dynamique (CNRS and Institute Pierre Simon Laplace, IPSL), École Normale Supérieure and Paris Sciences and Lettres (PSL) Research University, Paris, 75005, France, Research Domain IV–Transdisciplinary Concepts and Methods, Potsdam Institute for Climate Impact Research, Potsdam, 14473, Germany, Grantham Institute, Imperial College, London, SW7 2AZ, United Kingdom; Ghil, M., Geosciences Department, Laboratoire de Météorologie Dynamique (CNRS and Institute Pierre Simon Laplace, IPSL), École Normale Supérieure and Paris Sciences and Lettres (PSL) Research University, Paris, 75005, France, Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA 90095, United States; Rousseau, D.-D., Geosciences Department, Laboratoire de Météorologie Dynamique (CNRS and Institute Pierre Simon Laplace, IPSL), École Normale Supérieure and Paris Sciences and Lettres (PSL) Research University, Paris, 75005, France, Lamont-Doherty Eart...
推荐引用方式 GB/T 7714	Boers N.,Ghil M.,Rousseau D.-D.. Ocean circulation; ice shelf; and sea ice interactions explain Dansgaard–Oeschger cycles[J],2018,115(47).
APA	Boers N.,Ghil M.,&Rousseau D.-D..(2018).Ocean circulation; ice shelf; and sea ice interactions explain Dansgaard–Oeschger cycles.Proceedings of the National Academy of Sciences of the United States of America,115(47).
MLA	Boers N.,et al."Ocean circulation; ice shelf; and sea ice interactions explain Dansgaard–Oeschger cycles".Proceedings of the National Academy of Sciences of the United States of America 115.47(2018).